Early-month tracking from multiple South African fuel-price trackers points to a hike across the board for the September 2026 adjustment, with diesel taking by far the bigger hit. Unlike most of this year's price moves, this one is not primarily a rand story — the rand has actually been fairly resilient through August. It's an oil-price story, and specifically a Middle East risk story.
What the early projections show
Based on tracking data published through mid-to-late August, here's how the projected increase compares against current (August) inland pump and wholesale prices:
| Fuel Type | August Price | Projected Change | Projected September Price |
|---|---|---|---|
| Petrol 93 | R25.42/l | +66c/l | ~R26.08/l |
| Petrol 95 | R25.58/l | +77c/l | ~R26.35/l |
| Diesel 0.05% / 500ppm | R26.17/l | +R2.73/l | ~R28.90/l |
| Diesel 0.005% / 50ppm | R26.90/l | +R2.90/l | ~R29.80/l |
Why diesel is taking the bigger hit
Renewed conflict risk around Iran has pushed Brent crude back up toward $92 a barrel in the past two weeks, after a calmer stretch earlier in August. The rand has held up reasonably well through this — it traded around R16.33 to the dollar in early August, having recovered from a three-month low of R16.98 in late July — so currency weakness isn't the driver here.
What is driving it is where the risk sits: renewed shipping and Strait of Hormuz exposure hits distillate fuels — diesel, in particular — harder than petrol, because of how the international product price for each grade is set and how exposed each is to Middle East refining and export capacity. This is the same pattern that played out in August, when diesel gave back most of July's relief while petrol was largely protected by a Slate Levy cut.
What this means for you
For a 50-litre tank of Petrol 95, the projected September increase works out to roughly R38.50 more per fill-up than August. Diesel drivers are looking at a much bigger jump — around R135-R150 more per tank depending on grade, before any further movement in the final week of August.
If you run a diesel bakkie, a delivery fleet, or anything else where diesel is a meaningful monthly cost, this is worth budgeting for now rather than waiting for the official confirmation.
How the projections compared to the confirmed outcome
The official DMPR adjustment, effective 2 September 2026, came in higher than these early-month projections on every grade — the increase was worse for motorists than the numbers above suggested, mainly because the slate levy moved against consumers rather than staying flat.
| Fuel Type | Projected (24 Aug) | Confirmed (2 Sept) | Difference |
|---|---|---|---|
| Petrol 93 & 95 | +66c to +85c/l | +R1.34/l | Worse than projected on every estimate |
| Diesel 0.05% / 500ppm | +R2.73/l | +R2.94/l | R0.21/l worse than the low-end projection |
| Diesel 0.005% / 50ppm | +R2.90 to +R2.99/l | +R3.15/l | R0.16-0.25/l worse than projected |
Brent crude rose from an average of $82.37 to $87.88 a barrel on renewed US-Iran tension and Strait of Hormuz uncertainty — roughly in line with what these projections anticipated. What the projections above didn't fully capture was the slate levy: it rose 21.90c/l (from 61.38c/l to 83.28c/l) rather than staying flat, adding directly to the increase on every grade. A stronger rand (R16.46 → R16.21) partly offset the damage but wasn't enough to bring petrol back into the projected range.
For the full breakdown of what changed and why, see this month's official SA fuel prices or the archived August 2026 adjustment for the prior month's context.
Track record: how reliable are these early projections?
Early-month projections are a useful heads-up, not a guarantee. Ahead of the July 2026 adjustment, mid-month projections actually understated the relief motorists got — the final cut came in cheaper than predicted on every grade. September told a different story again — projections were roughly right on direction but understated the size of the increase, mainly on the levy side rather than the oil price itself. See the full July predictions vs. outcome comparison for the earlier example. The takeaway holds across all three months: treat these numbers as a planning signal, not a locked-in price, until the DMPR confirms.
Prices kept climbing into October — see the October 2026 fuel price predictions for the early numbers on the next adjustment.
Frequently asked questions
Original figures were early-month projections from South African fuel-price trackers as at 24 August 2026, not an official CEF or DMPR release. Confirmed figures are the official DMPR announcement, effective 2 September 2026.
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